221441240 has 64 divisors (see below), whose sum is σ = 522244800. Its totient is φ = 84344832.

The previous prime is 221441237. The next prime is 221441377. The reversal of 221441240 is 42144122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287576 + ... + 288344.

It is an arithmetic number, because the mean of its divisors is an integer number (8160075).

Almost surely, 2^221441240 is an apocalyptic number.

221441240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221441240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261122400).

221441240 is an abundant number, since it is smaller than the sum of its proper divisors (300803560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221441240 is a wasteful number, since it uses less digits than its factorization.

221441240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 221441240 is about 14880.9018543904. The cubic root of 221441240 is about 604.9964619696.

Adding to 221441240 its reverse (42144122), we get a palindrome (263585362).

The spelling of 221441240 in words is "two hundred twenty-one million, four hundred forty-one thousand, two hundred forty".